高收缩性DMT、DMI、SIPM/EG三元共聚酯纤维热收缩机理的研究

The Study of thermal Contraction mechanism of high-Shrinkage DMT、DMI、SIPM/EG copolyester fiber

研究了高收缩性 DMT、DMI、SIPM/EG 共聚酯纤维的热收缩机理。实验表明:共聚酯纤维在低温收缩(<120℃)与高温收缩(>160℃)时其表观收缩活化能有所不同。根据 prevorsek 纤维结构的三相模型,测定了样品纤维的超分子结构参数,数据分析表明:低温收缩时纤维结构的改变主要在于“第三相”的解取向形成各向同性无定形,而高温收缩则形成折叠链结晶。实验数据还表明:纤维的收缩率与收缩前后“第三相”指数之差呈良好的销性关系。

The thermal contraction mechanism of highshrinkage DMT、DMI、 SIPM/EG Copolyester fiber has been studied. The experimental data indicate that the apparent shrinkage activi- ty energy of the copolyester fiber at lower temperature(<120℃)is different from that at higher temperature(7160℃). According to prevorsek's three phase model of fibers,the superm- olecular structuralparameters of samples were examined. The data analysis indicate that in the case of thermal contraction at lower temperature the alteration of fiber structure is the deorienta- tion of “third phase”and forms isotropic amorphous essentially,While at higher temperature it forms folded chain crystalline. The experimental data also indicate there is linear relationship be- tween the shrinkage of sample fibers and difference between “third ph- ase”index before and after thermal contraction.